wolf. Posted June 2, 2008 Share Posted June 2, 2008 I have a Long with a O-290, since a while every now and then the Oil P drops to zero or below 10psi then comes up again and so forth, if the engine is running for 20 min or more it happens less frequently. I have the non adjustable cage type relief valve. I cleaned the valve replaced the sphere and the spring and it worked for 3h flight now it does it again. Any ideas what the problem could be?? (zero Oil P makes me somehow nervous in flight) wolf. Quote Cosy Classic flying (ex LX-ACE) Varieze N39JC rebuilding Link to comment Share on other sites More sharing options...
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